CVE-2026-80920
CVE CVE-2026-80920EUVD EUVD-2026-75095Published 2026-09-09T16:13:17.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: io_uring: defer eventfd signaling when queued from a wakeup handler io_req_local_work_add() signals the CQ ring eventfd inline when it is the one to push the first entry onto ->work_list. For DEFER_TASKRUN rings that add is frequently done from a waitqueue wakeup handler, where an arbitrary waitqueue lock is held. eventfd_signal_mask() only refuses to recurse when current->in_eventfd is set, but that bit is set by eventfd_signal_mask() itself. If the wake chain starts somewhere else, signal goes out inline and can feed back into epoll. Add IOU_F_TWQ_IN_WAKE, set it on the task_work add done from the three waitqueue callbacks, and use it to force io_eventfd_signal() down the existing call_rcu_hurry() deferral instead of signaling inline.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux 6.1; patch: 7.3-rc1; patch: 0; 21a091b970cdbcf3e8ff829234b51be6f9192766 <b6bb334b0e9348887e3e55e1f494b0c3b8fbf59f; patch: 6.18.49; patch: 7.1.11; 21a091b970cdbcf3e8ff829234b51be6f9192766 <cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e; 21a091b970cdbcf3e8ff829234b51be6f9192766 <e22f4494cc9487d326e5e3067f33dea7c1e442b2; patch: 7.2.1; 21a091b970cdbcf3e8ff829234b51be6f9192766 <40b6ccf68731809ceb85c6e9f0f8f2ed61c7aa5a
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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